Aythya valisineria

It ranges from 19 to 22 inches in length and weighs 1.9 to 3.5 pounds, with a wingspan of 31 to 35 inches. It is the largest species in the Aythya genus, being similar in size to a mallard but with a heavier and more compact build than it. The canvasback has a distinctive wedge-shaped head and long graceful neck. The adult male has a black bill, a chestnut red head and neck, a black breast, a grayish back, black rump, and a blackish brown tail. Sides, back, and belly are white with fine vermiculation resembling the weave of a canvas, which gave rise to the bird's common name. The bill is blackish and the legs and feet are bluish-gray. The iris is bright red in the spring, but duller in the winter. The adult female also has a black bill, a light brown head and neck, grading into a darker brown chest and foreback. The sides, flanks, and back are grayish brown. The bill is blackish and the legs and feet are bluish-gray. Its sloping profile distinguishes it from other ducks.

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